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Southwest Highlands

Confidence

High for an unsettled and often cloudy period with rain at times though brighter and drier daytime Saturday. Lower for detail Sunday onwards but staying unsettled.

  • Friday
  • Saturday
  • Further outlook

Friday 17 August 2018

Weather hazards

Gales High likelihood Hide detail

Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.

Poor visibility Medium likelihood Show detail

Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.

Heavy persistent rain Low likelihood Show detail

Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.

Headline

Becoming dull and wet and also with gales and hill fog. Brighter during evening.

Weather at 800m

06:00 09:00 12:00 15:00 18:00 21:00
Cloudy Heavy rain Heavy rain Light rain Partly cloudy night Partly cloudy night
30% 70% 90% 80% 30% 20%
Chance of precipitation
1,800 2,200 3,200 3,100 2,000 1,800
Freezing level (m)
The level above which snow is expected to settle or the ground is expected to be frozen

Wind speed and direction (mph) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
1300m SW 30 36 S 36 44 S 39 48 SW 43 54 SW 41 51 SW 40 50
900m SW 23 29 SW 27 34 S 30 38 SW 34 43 SW 33 42 SW 35 44
600m SW 25 30 SW 31 37 S 32 39 SW 35 43 SW 32 42 SW 33 42
300m SW 13 22 S 15 24 S 16 27 SW 19 32 SW 15 28 SW 14 27
Glen SW 8 19 SW 8 23 S 11 28 SW 12 32 SW 9 25 SW 9 26

Temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
1300m 4 5 5 7 6 5
900m 6 7 8 9 9 8
600m 8 9 9 11 11 10
300m 11 11 11 13 13 12
Glen 12 12 13 14 15 14

Feels like temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
1300m -3 -2 -1 1 -1 -2
900m 1 2 2 4 4 2
600m 4 4 5 6 6 5
300m 8 8 8 9 10 9
Glen 11 11 11 12 13 12
Sunrise: 05:52   Sunset: 20:54
Moon phase: Waxing crescent

Weather

Showers continue overnight with brief clear periods. By dawn clouding over and the morning will see light sporadic rain gradually become more persistent during the late morning. The afternoon and early evening dull and wet with some moderate rainfall and copious hill fog. Brighter conditions follow from the northwest during the mid to late evening, with Arran and Cowal slowest to dry up.

Chance of cloud-free mountain/hill tops at 800m

40% at dawn with occasional cloud based between 600 and 900 metres, but reducing 10% by late morning as cloud thickens. Less than 10% during afternoon with cloud lowering 300-600metres, lowest bases on west facing coastal slopes. During evening slowly improving 70% from the northwest as clouds lift.

Visibility

Moderate or good at dawn but through the morning reducing moderate or poor as rain sets in. Widely poor till early evening and very poor at times in rain with even neighbouring slopes poorly defined and fog above mid mountain. Improving good from the northwest during the evening with better vistas by sunset.

Met Office Aberdeen meteorologist's view

Gales above 800 metres with some gusts 55mph from mid afternoon onwards. Not feeling as cold as shown on summits.

Saturday 18 August 2018

Sunrise: 05:54   Sunset: 20:51
Moon phase: First quarter

Weather

Bright with a few light passing showers but also some sunny intervals. Best of sun across Rannoch Moor and east of Nevis range. During the late evening and night overcast wet conditions start to spread up from the southwest.

Maximum wind speed expected

West to Southwest gusting 40-50mph early hours on summits, reducing 35mph during the morning then easing South or East 15 gust 25mph later.

Chance of cloud-free mountain/hill tops at 800m

60% with occasional gaps in cloud, but banks passing through at 750-1000 metres and patches 600 metres in showers. However later in evening reducing 20% from southwest as thicker cloud lowers to 600 metres.

Temperature

  • At 800m 8 rising 11C.
  • Glen 10 rising 17C.
  • Freezing level 2000M

Visibility

Mostly good with mid distance hills quite clear outwith showers. However reducing moderate then poor from the southwest later in the evening as rain sets in.

Sunday 19 August 2018

Sunrise: 05:56   Sunset: 20:49
Moon phase: First quarter

Dull, wet start with mist, hill fog and some heavier rain, especially across Arran, Cowal and southern Trossachs. Brighter more showery conditions will spread from the northwest through the late morning and afternoon, some sunny glimpses later. Winds will be mostly moderate and settle Northwesterly.

Monday 20 August 2018

Sunrise: 05:58   Sunset: 20:46
Moon phase: First quarter

Continuing unsettled and rather cloudy with some showery spells of rain, perhaps more persistent over Lochaber, Mull and north Argyll with hill fog. Mostly moderate or fresh winds.

Tuesday 21 August 2018

Sunrise: 06:00   Sunset: 20:44
Moon phase: First quarter

Thick cloud will bring periods of rain, heavy in places with hill fog and strengthening winds.

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